CVE-2023-53609: scsi: Revert "scsi: core: Do not increase scsi_device's iorequest_cnt if dispatch failed"

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-04 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: Revert "scsi: core: Do not increase scsi_device's iorequest_cnt if dispatch failed" The "atomic_inc(&cmd->device->iorequest_cnt)" in scsi_queue_rq() would cause kernel panic because cmd->device may be freed after returning from scsi_dispatch_cmd(). This reverts commit cfee29ffb45b1c9798011b19d454637d1b0fe87d.

Affected products

Linux kernel: from 6.2 before 6.3.4; 6.4-rc1, 6.4-rc2 — fixed in 6.3.4

How to fix

Upgrade to a fixed version: Linux kernel 6.3.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-53609 or the next vulnerability affects your stack